Oil where it shouldn't be?

[Hammer]

By the way, thanks to whoever posted the hint to use a long extension and u-joint to get at the #4 plug a while back. I myself used a combination of a short extension, then the u-joint, then a long extension to clear the bracket. When putting the plug back in, I also had to remove the rubber insulator from the spark plug socket and just be really careful when tightening down. The spark plug socket kept getting stuck on the plug with the insulator...

3 words:
Magnetic Plug Socket... Makes life significantly easier...